Liquid fuel burner



E H HAUGEN LIQUID FUEL BURNER June 9, 1953 Filed Jan. 28, 1949 June 9,1953 E. H. HAUGEN LIQUID FUEL BURNER Filed Jan. 28, 1949 INVENTOR.Edmond h. Haugen Patented June 9, 1 953 UNITED STATES rPATENT OFFICELIQUID FUEL BURNER Application January 28, 1949, Serial No. 73,320

'l Claims.

This invention relates to liquid fuel burners and is particularlyconcerned with novel conn struction of a rotatable liquid fueldistributor for dispensing oil or like liquid fuel to be mixed with airand burned at a iiame rim disposed about the burner.

This is an improvement on the burner construction illustrated in UnitedStates Letters Patent No. 2,515,262 issued July 18, 1950, the particularimprovements consisting in details of construction and methods ofassembly of the ro'- tating distributor as will be hereinafter describedin detail.

It is therefore the major object of my invention to provide a noveliiuid fuel burner distribu tor construction and method of assembly whichis speedy, efficient and inexpensive, and provides improved accuracy ofrelation of the parts, thereby producing a burner rotor assembly whichis accurately balanced and has long life in operation withoutreplacement or repair.

A further object of the invention is to provide a structure and methodof assembly of a liquid fuel distributor wherein the flinger tubes aresecured to the head in a novel manner.

It is a further object of my invention to provide an improved liquidfuel distributor and method of assembly wherein the cone which liftsliquid fuel to the level of the dinger tubes during rotation of thedistributor is assembled with the distributor head in a novel manner.

A further object of the invention is to provide a novel liquid fuelburner distributor and method of assembly wherein each flinger tube hasits lower portion press tted into a suitable aperture in the distributorhead with its lower end fiared within the head to aid in anchoring thehead and tube in a tight substantially permanent assembly.

It is a further object of my invention to provide an improved liquidfuel distributor and method of assembly wherein the liquid fuel liftingcone is press tted within the distributor head in accurate alignmenttherewith, and anchored; thereto in anovel manner.

Further objects of the invention will presently appear as thedescription proceeds in connection with the appended claims and theannexed drawu ings wherein:

Figure 1 is an axial vertical section through a liquid fuel burnerconstructed according to a preferred embodiment of the invention,illustrating the assembled distributor;

Figure 2 is a fragmentary enlarged section illustrating the manner inwhich the lower end of each' flinger tube'is anchored within 'the'distribiitor head, and the head construction whereby the upper end ofthe cone is press fitted within the head and maintained there by aretainer ring;

Figure 3 is a fragmentary bottom end view of the iiinger tube anchoringbore in the head, illustrating the V-grooves in the ytapered rim;

Figure e is a fragmentary section illustrating how the metal from thelower ends of the iiinger tubes is forced into the V-grooves in theassembly; and

Figure 5 is an exploded View in section iilustrating the manner ofassembly of the parts.

Referring to Figure l, the burner of the invention is supported by asuitable upright stand i I and is mainly enclosed within a housingcomprising a lower cupwshaped motor casing i2 and an upper annularcollar I3, both of which are se cured to the stand and each other as bywelding a clown-turned rim lli on the collar to stand ii and by means ofa bolt and wing nut assembly l5 extending between the collar and casingif.

The burner motor is an electric motor indi cated at i6 and is supportedby a suitable resilient bushing Il which is mounted on the aberm turedlower wall I8 of motor casing l2. Bushing Il is centered with motorcasing I2 and comprises an annular body of rubber iii compressed betweeninner and outer metal shells 2i] and 2i, the inner shell 2l) beingrigidly press fitted upon the cylindrical portion 22 of a core memberTheouter shell 2| has secured thereto a clamp band 24 formed with aradially projecting fiange 25 adapted to overlie wall i8 of the motorcasing when the motor assembly is seated within casi ing i2.

Above its cylindrical portion 22, core 23 formed with a radial flange 25for supporting the stator of the electric motor including the laminatedcore 21 and field coils 28, these being secured to flange 26 as bymachine screws Above upper coil 23, an inverted cupnshaped collar at ispress fitted over the top of the core 25, being apertured to clear therotatable distributor. A pin 3l rigid with flange 26 projects downwardlythrough a rubber grommet 32 in motor casing wall I8 to therebyresiliently restrain the entire motor assembly, which rests by its ownweight on bottom wall i8 of casing i2, from turning about the verticalaxis of the distributor during operation. The above desirable structureand resilient mounting of the motor assembly is described and claimed insaid Letters Patent No. 2,515,262 to which attention is directed fordetail.

The entire distributor head assembly comprising the fan 33, thedistributor head 3A., flinger tubes 35'and 36, shaft 31 upon the upperend 'of which fan 33 is secured as by screws 38 and the oil lift cone 39is removable as a unit from the assembly by pulling it straight upwardlythrough the aperture in collar I3.

As illustrated in Figure l, the upper part of core member 23 isinternally threaded to receive the lower end of a sleeve 4I that extendsupwardly to about the level of the top of the stator core for receivingthe shaft 31 and providing a long internal cylindrical bore #lf2 foi supporting the shaft in a truly upright position during rotation.

An annular integral collar i3 on core flange 26 extends upwardlyparallel to sleeve ci to terminate a short distance below the top of thesleeve and form therewith an annular well i4 for collecting oil to belifted to the fiinger tube ny the cone 3S during rotation as will bedescribed.

Oil is supplied to well 4d through a conduit ntting d5 opening into thebore 45 in the lower part of core 23, and bore 46 is enlarged at 41 toreceive a compression spring 48 that supports a fiat hardened steelwasher i9 just below the lower end of sleeve I and is adapted to serveas a thrust bearing upon which rests the ball bearing lower end of shaft31. From bore d5, oil flows upwardly through channels 5I in core member23 and through radial slots 52 in flange 25 into the bottom of well 4din which the level is preferably maintained by a suitable gravity feedand level arrangement (not shown).

The distributor head 35 comprises an inverted cup-shaped member which ispreferably a machined metal casting, Head Sli comprises an eX- ternalconical shoulder 53 which terminates in a cylindrical portion 54 and aradial flange 55. Inwardly of flange 55, head 3d is machined to providea cylindrical wall 55 and a smaller shorter cylindrical wall 51 inlongitudinal succession. Upwardly of wall 51', head 34 is formed with aninternal conical wall 53 generally parallel to shoulder 53.

Head Sli is formed with two diametrically cp posits bores 53 and Gilwhich are inclined at equal angles, about 18 to 'the vertical. Asillustrated in Figures 2 and 3, bore 55 is formed at its lower end withan enlarged `conical countersunk rim GI in which are indented a series,preferably three, of V-grooves 62 that increase indepth and widthoutwardly of the axis of the bore. Bore [it is similarly terminated, andthe purpose of these grooves will be later explained.

The lower ends of 'tubes 35 and 313 areshouldered at 53 to seat squarelyon wall 153 and provide reduced thin-walled end portions Si', that pressfit into bores 5g and Sli. In assembly, each dinger tube pressed 'intoits bore 59 and Si), and then the end of the tube is ared outwardlyagainst the rim 5i. As illustrated in -Figure 4, some of the lmetal ofthe tube end is forced into the grooves 52 during thisoperatio'n, andthe lower ends of the tubes are thus enlargedand anchored to restrainthem against both longitudinal and rotational movement in the bores.

Cone 39 is press fitted within head 311 Ywith its outturned cylindricalend flange -65 machined to nt tightly within the wall surface 5`I sothat when the cone advances into the head its flange 65 vwill be pressittedwith'the wall 51. VIn crder to securely retain the cone'within thehead, additional securing means .is provided in the form of an `annularcylindrical attachment ring 66 press fitted within the wall 56 with itsupper end tightly .engaging the -under side of cone flange 65. Thismanner of securing the cone within the'head dis- .penses with thehitherto used silver soldered connections and provides a mechanicalsecuring operation Which is efficient and sure and which both accuratelylocates and retains the cone in assembled axial alignment with thecentral shaft receiving bore 61 of the head that is coaxial with walls56 and 51.

Shaft 31 which is laterally supported by bore 42 is formed with spacedbearing surfaces 6B and 59 that fit bore 42 with a rotating runningclearance. Lower bearing surface S8 is formed with a helical surfacegroove 1I that tends to lift oil up into the interior of the sleeve andlubricate the bearing surfaces at 58 and 69. The distributor head 34 ispress tted on the upper portion of bearing surface 65 well above theupper end of sleeve 4 I. The motor rotor 12 is secured to ange 55 as bymachine screws 13 in surrounding relation to the collar 43.

Cone 39 carries an oil slinger ring 14 and a surge prevention ring 15.These rings are press ntted upon machined cylindrical surfaces 16 and'I1 respectively on the outer surface of the cone prior to assembly ofthe cone with head 34.

The method of assembling the distributor of the invention is novel andproduces an accurately aligned and centered assembly.

The rst operation, after machining head 35, to provide bores 5B, Bil and61 and surfaces 5G and 51 of proper diameter, is to assemble the dingertubes with the head. rhis is accomplished as above explained, byinserting the tube ends Bxl into press fit relation with bores 5e andGli and spinning over the inner ends of the tubes onto rims 6 I.

Next the cone 39 with the peripheral surface of flange S5 formed to sizeis inserted into the cup of the lower part of the head 3d. Prior toinsertion, cone 39, which is preferably a sheet metal stamping, ismachined at iiange 55 to provide a cylindrical circumferential surface18 for press fit with surface 51 and a fiat annular top surface I9 thatabuts against an internal ledge SI above surface 51 when the cone flangehas been pressed into the position of Figures 1 and .2. Cone stamping 39is also machined to provide cylindrical surfaces 16 and 11 for press litof the slinger and surge prevention rings prior to incorporation of thecone assembly with head 34.

Preferably the cone assembly and head 3l? are suitably, slidabiy andcoaxially mounted with the cone on a suitable mandrel 82 having a part83 extending through 'bore (il and a larger diameter S4 to suit thelower cone opening, and While so maintained and guided in accuratealignment they are pressed together until surface 19 contacts ledge 8I.Then the attachment ring 66 is pressed into surface 55 until its innerend abuts flange 55. Preferably ring 66 has the same axial length assurface 56, and it reenforces the joint between the head and the coneassembly.

Then the shaft 31 is press fitted into bore 61 and head `34 is locatedproperly with respect to the fan and bearing ends of the shaft.'Preferably this operation takes place while the head is in the samefixture as in pressing the cone into place. Now head flange 55 vismachined to seat the motorrotor 12, the rotor attached to the shaft andfan 33 mounted on 'the shaft and the entire rotatable assembly is readyto drop into the stationary part of the burner.

Thus the several parts of therotor assembly are all press fitted tightlytogether, without thenecessity of silver solderedor brazed connections,as heretofore wasthe case. This understandably a less expensive methodof assembly but it also unexpectedly provides a considerably moreaccurate assembly particularly with respect to alignment of the cone andshaft axes. parts had to be heated during assembly operations, as insoldering and brazing, there was a tendency toward Warpage of therelatively thin metal cone and consequent misalignment with the shaftwhen cooled, and this is absolutely prevented by the process of theinvention.

This advantage of accuracy of alignment and prevention of cone warpageis obtained by press fitting the slinger and surge prevention rings ontothe cone instead of soldering them in place as previously was thepractice. The spinning over of the lower inger tube ends provides ananchorage that is superior to the hydrogen brazed attachment heretoforeemployed, and insures against misalignment of the tubes with respect tothe shaft 3l.

Ordinarily all of the rotor parts are rust proofed with a gun metalfinish before assembly.

The distributor shaft is preferably machined to final shape and thenhardened before assembly with head 34. Because it is easier to machineprior to hardening, groove 1| is therefore more accurately cut and itprovides an improved positive pumping action. Preferably also the upperend of the shaft 3l is relieved to permit more accurate aligned assemblyof the head and shaft, this preventing broaching of the head andenabling the shorter bearing surface 69 to be held to more accuratedimensions.

I have therefore provided a novel distributor rotor and method ofassembly which contributes to a more accurate, uniform distribution ofthe oil spray for a wall flame burner and the accurately related andbalanced parts provide a quietness of operation over a long life thathas hitherto been not obtainable.

The invention may be embodied in other specil-lc forms without departingfrom the spirit or essential characteristics thereof. The presentembodiment is therefore to be considered in all respects as illustrativeand not restrictive, the scope of the invention being indicatedby theappended claims rather than by the foregoing description, and al1changes which come Within the meaning and range of equivalency of theclaims are therefore intended to be embraced therein.

Where these" What is claimed and desired to be secured by United StatesLetters Patent is:

1. In a fuel oil burner, a rotor comprising a head, angularly disposedoil flinger tubes secured upon said head, a central shaft secured tosaid head, an oil lift cone having its upper end press fitted into saidhead, and an attachment ring for said cone press fitted into said headinto abutment with said cone.

2. In the fuel oil burner defined in claim l, said cone being formed atits upper end with an outwardly directed flange that is press fittedinto abutment with the correspondingly formed lower end of said head,and said attachment ring clamping the cone fiange against said head.

3. In a fuel oil burner, a rotor comprising a head having a centralvertical bore and equally spaced angularly disposed bores, angularlydisposed oil flinger tubes secured in said spaced bores, a shaft pressfitted into said vertical bore, an oil lift cone surrounding the shaftand having its upper end press fitted within said head, an attachmentring for said cone press tted into said head into abutment with thecone, and an oil slinger ring press fitted onto the periphery of saidcone intermediate its ends.

4. In an oil burner, an inverted cup-shaped head having a central boreand two diametrically opposite inclined side bores, the interior of saidcup being formed with a bottom surface surrounding said central bore andintersected by said inclined side bores and an adjacent cylindrical sidesurface coaxial with said central bore, an oil lift cone having an upperflanged end press fitted with said cylindrical surface, and anattachment ring tight with said head abutting against said ange forsecuring said cone against axial displacement with respect to said bore.

EDMOND H. HAUGEN.

References Cited in the file of this patent UNITED lSTATES PATENTSNumber Name Date 1,058,542 Brown Apr. 8, 1913 1,883,906 Hasselquist Oct.25, 1932 1,888,693 Powers Nov. 22, 1932 2,181,249 Powers Nov. 28, 19392,310,333 Wilson et al. Feb. 9, 1943 2,515,262 Powers July 18, 1950

